JVC VS-DT2000 Service Manual page 33

LC72136N (IC2) : PLL frequency synthesizer
1. Terminal layout
XOUT 1 XIN
22
FM 2
VSS
21
CE 3
LPFOUT
20
DI 4 LPFIN
19
CK 5 PD
18
DO 6
VDD
17
ST/MONO 7
FMOSC
16
AM/FM 8 AMOSC
15
LW 9
14
MW 10
IF REQ
13
SDIN 11
FM/AMIF
12
3. Pin function
Pin No. Symbol
1 XOUT
2 FM
3 CE
4 DI
5 CK
6 DO
7 ST/MONO
8 AM/FM
9 LW
10 MW
11 SDIN
12 FM/AM IF
13 IF REQ
14
15 AMOSC
16 FMOSC
17 VDD
18 PD
19 LPFIN
20 LPFOUT
21 VSS
22 XIN
2. Block diagram
1
22
16
15
3
4
5
6
17
21
I/O
I X'tal oscillator connect (75kHz)
O LOW:FM mode
I Chip enable, When data output/input for 4pin(input) and 6pin(output): H
I Input for receive the serial data from controller
I Sync signal input use
O Data output for Controller, Output port
O "Low": MW mode
O Open state after the power on reset
I/O Input/output port
I/O Input/output port
I/O Data input/output
I IF counter signal input
O IF signal output
- Not use
I AM Local OSC signal output
I FM Local OSC signal input
- Power supply(VDD=4.5-5.5V), When power ON:Reset circuit move
O PLL charge pump output(H: Local OSC frequency Height than Reference
frequency. L: Low Agreement: Height impedance)
I Input for active low pass filter of PLL
O Output for active low pass filter of PLL
- Connected to GND
I X'tal oscillator connect (75KHz)
Reference
Driver
Swallow Counter
1/2
1/16,1/17 4bit
12bit
Programmable
Drivers
C2B
Data Shift Register & Latch
I/F
Power
on
Reset
7 8 2
Function
VS-DT2000
Phase
Detector
Charge Pump
Unlock
Detector
Universal
Counter
11 13
18
19
20
12
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